{"id":863,"date":"2018-07-20T09:02:05","date_gmt":"2018-07-20T01:02:05","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=863"},"modified":"2018-07-20T09:02:05","modified_gmt":"2018-07-20T01:02:05","slug":"%e3%80%90jvm%e3%80%91jvm%e7%b3%bb%e5%88%97%e4%b9%8b%e6%89%a7%e8%a1%8c%e5%bc%95%e6%93%8e%ef%bc%88%e4%ba%94%ef%bc%89","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=863","title":{"rendered":"\u3010JVM\u3011JVM\u7cfb\u5217\u4e4b\u6267\u884c\u5f15\u64ce\uff08\u4e94\uff09"},"content":{"rendered":"

\u4e00\u3001\u524d\u8a00<\/strong><\/p>\n

\u5728\u4e86\u89e3\u4e86\u7c7b\u52a0\u8f7d\u7684\u76f8\u5173\u4fe1\u606f\u540e\uff0c\u6709\u5fc5\u8981\u8fdb\u884c\u66f4\u6df1\u5165\u7684\u5b66\u4e60\uff0c\u4e86\u89e3\u6267\u884c\u5f15\u64ce\u7684\u7ec6\u8282\uff0c\u5982\u5b57\u8282\u7801\u662f\u5982\u4f55\u88ab\u865a\u62df\u673a\u6267\u884c\u4ece\u800c\u5b8c\u6210\u6307\u5b9a\u529f\u80fd\u7684\u5462\u3002\u4e0b\u9762\uff0c\u6211\u4eec\u5c06\u8fdb\u884c\u6df1\u5165\u7684\u5206\u6790\u3002<\/p>\n

\u4e8c\u3001\u6808\u5e27<\/strong><\/p>\n

\u6211\u4eec\u77e5\u9053\uff0c\u5728\u865a\u62df\u673a\u4e2d\u4e0e\u6267\u884c\u65b9\u6cd5\u6700\u76f8\u5173\u7684\u662f\u6808\u5e27\uff0c\u7a0b\u5e8f\u7684\u6267\u884c\u5bf9\u5e94\u7740\u6808\u5e27\u7684\u5165\u6808\u548c\u51fa\u6808\uff0c\u6240\u4ee5\u6808\u5e27\u5bf9\u4e8e\u6267\u884c\u5f15\u64ce\u800c\u8a00\uff0c\u662f\u5f88\u91cd\u8981\u7684\u57fa\u7840\u3002\u6808\u5e27\u7684\u57fa\u672c\u7ed3\u6784\u4e4b\u524d\u5df2\u7ecf\u6709\u6240\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u53ea\u662f\u518d\u7b80\u5355\u7684\u8fc7\u4e00\u904d\u3002<\/p>\n

\u6808\u5e27\u4e3b\u8981\u5305\u62ec\u4e86\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u8fde\u63a5\u3001\u65b9\u6cd5\u8fd4\u56de\u5730\u5740\u7b49\u4fe1\u606f\u3002<\/p>\n

2.1 \u5c40\u90e8\u53d8\u91cf\u8868<\/p>\n

\u7528\u4e8e\u5b58\u653e\u65b9\u6cd5\u53c2\u6570\u548c\u65b9\u6cd5\u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\u3002\u5c40\u90e8\u53d8\u91cf\u8868\u7684\u5927\u5c0f\u5728\u65b9\u6cd5\u7684Code\u5c5e\u6027\u4e2d\u5c31\u5df2\u7ecf\u5b9a\u4e49\u597d\u4e86\uff0c\u4e3amax_locals\u7684\u503c\uff0c\u5c40\u90e8\u53d8\u91cf\u8868\u7684\u5355\u4f4d\u4e3aslot\uff0c32\u4f4d\u4ee5\u5185\u7684\u7c7b\u578b\u53ea\u5360\u7528\u4e00\u4e2aslot\uff08\u5305\u62ecreturnAddress\u7c7b\u578b\uff09\uff0c64\u4f4d\u7684\u7c7b\u578b\u5360\u7528\u4e24\u4e2aslot\u3002\u6ce8\u610f\uff0c\u5bf9\u4e8e\u5b9e\u4f8b\u65b9\u6cd5\u800c\u8a00\uff0c\u7d22\u5f15\u4e3a0\u7684slot\u5b58\u653e\u7684\u662fthis\u5f15\u7528\uff0c\u4e4b\u540e\u518d\u4f9d\u6b21\u5b58\u653e\u65b9\u6cd5\u53c2\u6570\uff0c\u5b9a\u4e49\u7684\u5c40\u90e8\u53d8\u91cf\uff1bslot\u53ef\u4ee5\u88ab\u91cd\u7528\uff0c\u5f53\u5c40\u90e8\u53d8\u91cf\u5df2\u7ecf\u8d85\u51fa\u4e86\u4f5c\u7528\u57df\u65f6\uff0c\u5728\u4f5c\u7528\u57df\u5916\u5728\u5b9a\u4e49\u5c40\u90e8\u53d8\u91cf\u65f6\uff0c\u53ef\u4ee5\u91cd\u7528\u4e4b\u524d\u7684slot\u7a7a\u95f4\u3002\u540c\u65f6\uff0c\u5c40\u90e8\u53d8\u91cf\u6ca1\u6709\u8d4b\u503c\u662f\u4e0d\u80fd\u591f\u4f7f\u7528\u7684\uff0c\u8fd9\u548c\u7c7b\u53d8\u91cf\u548c\u5b9e\u4f8b\u53d8\u91cf\u662f\u6709\u4e0d\u540c\u7684\uff0c\u5982\u4e0b\u9762\u4ee3\u7801\uff1a<\/p>\n

\n
public void test() {\n    int i;\n    System.out.println(i);\n}<\/pre>\n<\/div>\n
\u8fd9\u6837\u7684\u4ee3\u7801\u662f\u9519\u8bef\u7684\uff0c\u6ca1\u6709\u8d4b\u503c\u4e0d\u80fd\u591f\u4f7f\u7528\u3002<\/p>\n
2.2 \u64cd\u4f5c\u6570\u6808<\/p>\n
\u6267\u884c\u65b9\u6cd5\u65f6\uff0c\u5b58\u653e\u64cd\u4f5c\u6570\u7684\u6808\uff0c\u6808\u7684\u6df1\u5ea6\u5728\u65b9\u6cd5\u7684Code\u5c5e\u6027\u4e2d\u5df2\u7ecf\u5b9a\u4e49\u597d\u4e86\uff0c\u4e3amax_stack\u7684\u503c\uff0c32\u4f4d\u4ee5\u5185\u7684\u7c7b\u578b\u5360\u7528\u4e00\u4e2a\u6808\u5355\u4f4d\uff0c64\u4e3a\u7684\u7c7b\u578b\u5360\u7528\u4e24\u4e2a\u6808\u5355\u4f4d\u3002\u64cd\u4f5c\u6570\u6808\u53ef\u4ee5\u4e0e\u5176\u4ed6\u6808\u7684\u5c40\u90e8\u53d8\u91cf\u8868\u5171\u4eab\u533a\u57df\uff0c\u8fd9\u6837\u53ef\u4ee5\u5171\u7528\u4e00\u90e8\u5206\u6570\u636e\u3002<\/p>\n
2.3 \u52a8\u6001\u8fde\u63a5<\/p>\n
\u52a8\u6001\u8fde\u63a5\u662f\u4e3a\u4e86\u652f\u6301\u5728\u8fd0\u884c\u671f\u95f4\u5c06\u7b26\u53f7\u5f15\u7528\u8f6c\u5316\u4e3a\u76f4\u63a5\u5f15\u7528\u7684\u64cd\u4f5c\u3002\u6211\u4eec\u77e5\u9053\uff0c\u6bcf\u4e00\u4e2a\u65b9\u6cd5\u5bf9\u5e94\u4e00\u4e2a\u6808\u5e27\uff0c\u800c\u6bcf\u4e00\u4e2a\u6808\u5e27\uff0c\u90fd\u5305\u542b\u6307\u5411\u5bf9\u5e94\u65b9\u6cd5\u7684\u5f15\u7528\uff0c\u8fd9\u4e2a\u5f15\u7528\u5c31\u662f\u4e3a\u4e86\u652f\u6301\u52a8\u6001\u8fde\u63a5\uff0c\u5982invokedynamic\u6307\u4ee4\u3002\u52a8\u6001\u8fde\u63a5\u4e0e\u9759\u6001\u89e3\u6790\u5bf9\u5e94\uff0c\u9759\u6001\u89e3\u6790\u662f\u5728\u7c7b\u52a0\u8f7d\uff08\u89e3\u6790\u9636\u6bb5\uff09\u6216\u8005\u7b2c\u4e00\u6b21\u4f7f\u7528\u65f6\u5c06\u7b26\u53f7\u5f15\u7528\u8f6c\u5316\u4e3a\u76f4\u63a5\u5f15\u7528\uff0c\u52a8\u6001\u8fde\u63a5\u5219\u662f\u6bcf\u4e00\u6b21\u8fd0\u884c\u7684\u65f6\u5019\u90fd\u9700\u8981\u8fdb\u884c\u8f6c\u5316(invokedynamic\u6307\u4ee4)\u3002<\/p>\n
2.4 \u65b9\u6cd5\u8fd4\u56de\u5730\u5740<\/p>\n
\u6b63\u5e38\u65b9\u6cd5\u8fd4\u56de\uff0c\u8fd4\u56de\u5730\u5740\u4e3a\u5230\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u6307\u4ee4\u7684\u4e0b\u4e00\u6761\u6307\u4ee4\u7684\u5730\u5740\uff1b\u5f02\u5e38\u8fd4\u56de\uff0c\u8fd4\u56de\u5730\u5740\u7531\u5f02\u5e38\u8868\u786e\u5b9a\u3002\u65b9\u6cd5\u8fd4\u56de\u65f6\uff0c\u9700\u8981\u6062\u590d\u4e0a\u5c42\u65b9\u6cd5\u7684\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u5c06\u8fd4\u56de\u503c\u538b\u5165\u8c03\u7528\u8005\u6808\u5e27\u7684\u64cd\u4f5c\u6570\u6808\u3001\u8bbe\u7f6ePC\u503c\u3002<\/p>\n
\u4e09\u3001\u65b9\u6cd5\u8c03\u7528<\/strong><\/p>\n
\u5728\u5206\u6790\u4e86\u6808\u5e27\u540e\uff0c\u6211\u4eec\u63a5\u7740\u5206\u6790\u65b9\u6cd5\u8c03\u7528\uff0c\u65b9\u6cd5\u8c03\u7528\u4f1a\u5bfc\u81f4\u6808\u5e27\u5165\u6808\uff0c\u800c\u65b9\u6cd5\u8c03\u7528\u4f1a\u786e\u5b9a\u8c03\u7528\u54ea\u4e00\u4e2a\u65b9\u6cd5\uff0c\u8fd8\u4e0d\u4f1a\u6d89\u53ca\u5230\u5177\u4f53\u7684\u65b9\u6cd5\u4f53\u6267\u884c\u3002<\/p>\n
3.1 \u89e3\u6790<\/p>\n
\u5728\u7a0b\u5e8f\u6267\u884c\u524d\u5c31\u5df2\u7ecf\u786e\u5b9a\u4e86\u65b9\u6cd5\u8c03\u7528\u7684\u7248\u672c\uff0c\u5373\u7f16\u8bd1\u671f\u5c31\u786e\u5b9a\u4e86\u8c03\u7528\u65b9\u6cd5\u7248\u672c\uff0c\u8fd9\u4e2a\u7248\u672c\u5728\u8fd0\u884c\u65f6\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u9759\u6001\u65b9\u6cd5\u3001\u79c1\u6709\u65b9\u6cd5\u3001final\u65b9\u6cd5\u5728\u7f16\u8bd1\u65f6\u5c31\u53ef\u4ee5\u786e\u5b9a\u5177\u4f53\u7684\u8c03\u7528\u7248\u672c\uff0c\u9759\u6001\u65b9\u6cd5\u76f4\u63a5\u4e0e\u7c7b\u578b\u76f8\u5173\u3001\u79c1\u6709\u65b9\u6cd5\u5728\u5916\u90e8\u4e0d\u53ef\u8bbf\u95ee\u3001final\u4e0d\u53ef\u88ab\u7ee7\u627f\uff0c\u4e5f\u53ef\u552f\u4e00\u786e\u5b9a,\u8fd9\u4e9b\u65b9\u6cd5\u79f0\u4e3a\u975e\u865a\u65b9\u6cd5\uff0c\u5176\u4ed6\u65b9\u6cd5\u79f0\u4e3a\u865a\u65b9\u6cd5\u3002\u5728\u7c7b\u52a0\u8f7d\u7684\u89e3\u6790\u9636\u6bb5\u5c31\u53ef\u4ee5\u8fdb\u884c\u89e3\u6790\uff0c\u5982\u4e0b\u65b9\u6cd5\u8c03\u7528\u5728\u7f16\u8bd1\u671f\u5c31\u53ef\u4ee5\u786e\u5b9a\u65b9\u6cd5\u8c03\u7528\u7684\u7248\u672c\u3002<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
class Father {\n    public static void print(String str) {\n        System.out.println(\"father \" + str);\n    }\n\n    private void show(String str) {\n        System.out.println(\"father \" + str);\n    }\n}\n\nclass Son extends Father {\n\n}\n\npublic class Test {\n    public static void main(String[] args) {\n        Son.print(\"coder\");\n        \/\/Father fa = new Father();\n        \/\/fa.show(\"cooooder\");\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
fatcher coder<\/p>\n
\u8bf4\u660e\uff1aSon.print\u5b9e\u9645\u4e0a\u8c03\u7528\u7684\u662fFather\u7684print\u65b9\u6cd5\uff0cprint\u65b9\u6cd5\u4e0eFather\u7c7b\u578b\u662f\u76f8\u5173\u7684\uff0c\u800cshow\u65b9\u6cd5\u65f6\u79c1\u6709\u7684\u65b9\u6cd5\uff0c\u5728Main\u4e2d\u65e0\u6cd5\u8c03\u7528\uff0c\u53ea\u80fd\u5728Father\u7684\u5185\u90e8\u8c03\u7528\uff0c\u4e5f\u662f\u786e\u5b9a\u7684\u3002<\/p>\n
invokestatic(\u8c03\u7528\u9759\u6001\u65b9\u6cd5)\u3001invokespecial(\u8c03\u7528\u5b9e\u4f8b\u6784\u9020\u5668<init>\u65b9\u6cd5\u3001\u79c1\u6709\u65b9\u6cd5\u3001\u7236\u7c7b\u65b9\u6cd5)\u90fd\u662f\u5728\u7f16\u8bd1\u671f\u5c31\u53ef\u4ee5\u786e\u5b9a\u7248\u672c\u7684\u3002<\/p>\n
3.2 \u5206\u6d3e<\/p>\n
\u5206\u6d3e\u8c03\u7528\u4e0e\u591a\u6001\u5bc6\u5207\u76f8\u5173\uff0c\u5206\u4e3a\u9759\u6001\u5206\u6d3e\u3001\u52a8\u6001\u5206\u6d3e\u3001\u5355\u5206\u6d3e\u3001\u591a\u5206\u6d3e\u3002<\/p>\n
1. \u9759\u6001\u5206\u6d3e<\/p>\n
\u4e0e\u9759\u6001\u5206\u6d3e\u76f8\u5173\u7684\u5c31\u662f\u65b9\u6cd5\u7684\u91cd\u8f7d\uff0c\u91cd\u8f7d\u65f6\u6839\u636e\u53c2\u6570\u7684\u9759\u6001\u7c7b\u578b\u5f15\u7528\u7c7b\u578b\u800c\u975e\u5b9e\u9645\u7c7b\u578b\u51b3\u5b9a\u8c03\u7528\u54ea\u4e2a\u7248\u672c\u3002<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\/*\n * \u91cd\u8f7d\u65b9\u6cd5\u5728\u7f16\u8bd1\u5668\u5c31\u53ef\u4ee5\u8fdb\u884c\u786e\u5b9a\uff0c\u4e0d\u9700\u8981\u7b49\u5230\u8fd0\u884c\u671f\u95f4\n * *\/\npublic class StaticDispatch {\n    static class Human {\n        \/\/\n    }\n\n    static class Women extends Human {\n        \/\/\n    }\n\n    static class Men extends Human {\n        \/\/\n    }\n\n    public void sayHello(Human human) {\n        System.out.println(\"say human\");\n    }\n\n    public void sayHello(Women women) {\n        System.out.println(\"say women\");\n    }\n\n    public void sayHello(Men men) {\n        System.out.println(\"say men\");\n    }\n\n    public static void main(String[] args) {\n        StaticDispatch ds = new StaticDispatch();\n        Human women = new Women();\n        Human men = new Men();\n\n        ds.sayHello(women);\n        ds.sayHello(men);\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
say human
\nsay human<\/p>\n
\u8bf4\u660e\uff1a\u7531\u4e8e\u9759\u6001\u7c7b\u578b\uff08\u5f15\u7528\u7c7b\u578b\uff09\u4e3aHuman\uff0c\u5728\u7f16\u8bd1\u671f\u5c31\u53ef\u4ee5\u786e\u5b9a\u65b9\u6cd5\u7684\u8c03\u7528\u7248\u672c\u662f\u4ee5Human\u53c2\u6570\u7684\u65b9\u6cd5\uff0c\u548c\u5b9e\u9645\u7c7b\u578b\u65e0\u5173\u3002<\/p>\n
2. \u52a8\u6001\u5206\u6d3e<\/p>\n
\u4e0e\u52a8\u6001\u5206\u6d3e\u76f8\u5173\u7684\u5c31\u662f\u65b9\u6cd5\u7684\u91cd\u5199\uff0c\u5728\u5b50\u7c7b\u4e2d\u6211\u4eec\u4f1a\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u800c\u5728\u8c03\u7528\u7684\u65f6\u5019\u6839\u636e\u5b9e\u9645\u7c7b\u578b\u6765\u5ba3\u548c\u9002\u5408\u7684\u8c03\u7528\u7248\u672c\u3002<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic class DynamicDispatch {\n    abstract static class Human {\n        abstract public void sayHello();\n    }\n\n    static class Women extends Human {\n        @Override\n        public void sayHello() {\n            System.out.println(\"say women\");\n        }\n    }\n\n    static class Men extends Human {\n        @Override\n        public void sayHello() {\n            System.out.println(\"say men\");\n        }\n    }\n\n    public static void main(String[] args) {\n        Human women = new Women();\n        Human men = new Men();\n        women.sayHello();\n        men.sayHello();\n\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
say women
\nsay men<\/p>\n
\u8bf4\u660e\uff1a\u6b64\u65f6\u6839\u636e\u5b9e\u9645\u7c7b\u578b\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u8c03\u7528\uff0c\u5206\u522b\u8c03\u7528\u4e86women\u548cmen\u7684sayHello()\u65b9\u6cd5\u3002<\/p>\n
\u65b9\u6cd5\u7684\u63a5\u6536\u8005(\u65b9\u6cd5\u7684\u6240\u6709\u8005)\u4e0e\u65b9\u6cd5\u7684\u53c2\u6570\u7edf\u79f0\u4e3a\u65b9\u6cd5\u7684\u5b97\u91cf\uff0c\u6839\u636e\u5206\u6d3e\u57fa\u4e8e\u591a\u5c11\u79cd\u5b97\u91cf\uff0c\u53ef\u4ee5\u5c06\u5206\u6d3e\u5212\u5206\u4e3a\u5355\u5206\u6d3e\u548c\u591a\u5206\u6d3e\u3002<\/p>\n
3. \u5355\u5206\u6d3e\u4e0e\u591a\u5206\u6d3e<\/p>\n
\u5355\u5206\u6d3e\u6839\u636e\u4e00\u4e2a\u5b97\u91cf\u786e\u5b9a\u8c03\u7528\u65b9\u6cd5\u7684\u7248\u672c\uff1b\u591a\u5206\u6d3e\u6839\u636e\u591a\u4e2a\u5b97\u91cf\u786e\u5b9a\u8c03\u7528\u65b9\u6cd5\u7684\u7248\u672c\u3002<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\nimport com.leesf.chapter8.Test.Son;\n\npublic class Dispatch {\n    static class QQ {};\n    static class _360{};\n\n    public static class Father {\n        public void hardChoice(QQ arg) {\n            System.out.println(\"father choose qq\");\n        }\n\n        public void hardChoice(_360 arg) {\n            System.out.println(\"father choose 360\");\n        }\n    }\n\n    public static class Son extends Father {\n        public void hardChoice(QQ arg) {\n            System.out.println(\"son choose qq\");\n        }\n\n        public void hardChoice(_360 arg) {\n            System.out.println(\"son choose 360\");\n        }\n    }\n\n    public static void main(String[] args) {\n        Father father = new Father();\n        Father son = new Son();\n        father.hardChoice(new _360());\n        son.hardChoice(new QQ());\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
father choose 360
\nson choose qq<\/p>\n
\u8bf4\u660e\uff1a\u9759\u6001\u5206\u6d3e\u8fc7\u7a0b\u5982\u4e0b\uff0c\u5728\u7f16\u8bd1\u671f\u9636\u6bb5\uff0c\u4f1a\u6839\u636e\u9759\u6001\u7c7b\u578b\u4e0e\u53c2\u6570\u7c7b\u578b\u786e\u5b9a\u8c03\u7528\u7248\u672c\uff0c\u4ea7\u751f\u4e24\u6761\u5206\u522b\u6307\u5411Father.hardChoice(QQ)\u548cFather.hardChoice(_360)\u7684\u6307\u4ee4\uff0c\u53ef\u4ee5\u77e5\u9053\uff0c\u5728\u7f16\u8bd1\u671f\uff0c\u662f\u7531\u591a\u4e2a\u5b97\u91cf\u786e\u5b9a\u8c03\u7528\u7248\u672c\uff0c\u662f\u9759\u6001\u591a\u5206\u6d3e\u3002\u52a8\u6001\u5206\u6d3e\u8fc7\u7a0b\u5982\u4e0b\uff0c\u5728\u8fd0\u884c\u671f\uff0c\u5728\u6267\u884chardChoice(QQ)\u6216\u8005hardChoice(_360)\u65f6\uff0c\u5df2\u7ecf\u786e\u5b9a\u4e86\u53c2\u6570\u5fc5\u987b\u4e3aQQ\u3001_360\uff0c\u65b9\u6cd5\u7b7e\u540d\u786e\u5b9a\uff0c\u9759\u6001\u7c7b\u578b\u548c\u5b9e\u9645\u7c7b\u578b\u6b64\u65f6\u90fd\u4e0d\u4f1a\u5bf9\u65b9\u6cd5\u672c\u8eab\u4ea7\u751f\u4efb\u4f55\u5f71\u54cd\uff0c\u800c\u865a\u62df\u673a\u4f1a\u6839\u636e\u5b9e\u9645\u7c7b\u578b\u6765\u786e\u5b9a\u8c03\u7528\u7248\u672c\uff0c\u53ea\u6839\u636e\u4e00\u4e2a\u5b97\u91cf\u8fdb\u884c\u786e\u5b9a\uff0c\u56e0\u6b64\uff0c\u5728\u8fd0\u884c\u65f6\uff0c\u662f\u52a8\u6001\u5355\u5206\u6d3e\u3002<\/p>\n
3.3 \u52a8\u6001\u5206\u6d3e\u7684\u5b9e\u73b0<\/p>\n
\u5728\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u4e2d\uff0c\u4f1a\u5f88\u9891\u7e41\u7684\u4f7f\u7528\u5230\u52a8\u6001\u5206\u6d3e\uff0c\u5982\u4f55\u5b9e\u73b0\u52a8\u6001\u5206\u6d3e\u5462\uff1f\u865a\u62df\u673a\u91c7\u7528\u5728\u7c7b\u7684\u65b9\u6cd5\u533a\u5efa\u7acb\u4e00\u4e2a\u865a\u65b9\u6cd5\u8868(\u975e\u865a\u65b9\u6cd5\u4e0d\u4f1a\u51fa\u73b0\u5728\u8868\u4e2d)\u6765\u5b9e\u73b0\u3002\u4e0a\u9762\u7a0b\u5e8f\u7684\u865a\u65b9\u6cd5\u8868\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n
\"\"\u3000\u3000\u8bf4\u660e\uff1a\u4eceObject\u7c7b\u7ee7\u627f\u7684\u65b9\u6cd5\u90fd\u4f1a\u6307\u5411Object\u7c7b\u578b\u6570\u636e\u4e2d\u5404\u65b9\u6cd5\u7684\u5b9e\u9645\u5165\u53e3\u5730\u5740\u3002\u7c7b\u81ea\u8eab\u7684\u65b9\u6cd5\u4f1a\u6307\u5411\u7c7b\u7684\u6570\u636e\u7c7b\u578b\u4e2d\u65b9\u6cd5\u7684\u5b9e\u9645\u5165\u53e3\u5730\u5740\u3002\u7236\u7c7b\u7684\u6ca1\u6709\u88ab\u91cd\u5199\u7684\u65b9\u6cd5\u5728\u865a\u65b9\u6cd5\u8868\u4e2d\u7684\u7d22\u5f15\u4e0e\u5b50\u7c7b\u65b9\u6cd5\u8868\u4e2d\u7684\u7d22\u5f15\u76f8\u540c\uff0c\u8fd9\u6837\uff0c\u5f53\u7c7b\u578b\u53d8\u5316\u65f6\uff0c\u53ea\u9700\u8981\u6539\u53d8\u65b9\u6cd5\u8868\u5c31\u884c\uff0c\u7d22\u5f15\u8fd8\u662f\u76f8\u540c\u3002\u65b9\u6cd5\u8868\u4e00\u822c\u5728\u7c7b\u52a0\u8f7d\u7684\u8fde\u63a5\u9636\u6bb5\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u51c6\u5907\u4e86\u7c7b\u53d8\u91cf\u7684\u521d\u59cb\u503c\u540e\uff0c\u65b9\u6cd5\u8868\u4e5f\u521d\u59cb\u5316\u5b8c\u6bd5\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u518d\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u66f4\u52a0\u6df1\u5165\u4e86\u89e3\u65b9\u6cd5\u8868\u3002<\/p>\n
\u4e0b\u9762\u51e0\u4e2a\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u5982\u4e0b<\/p>\n
\"\"<\/p>\n
1. Friendly<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic interface Friendly {\n    void sayHello();\n    void sayGoodbye();\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
2. Dog<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic class Dog {\n    private int wagCount = ((int) (Math.random() * 5.0)) + 1;\n\n    public void sayHello() {\n        System.out.println(\"Wag\");\n        for (int i = 0; i < wagCount; i++)\n            System.out.println(\", wag\");\n    }\n\n    public String toString() {\n        return \"Woof\";\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
3. Cat<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic class Cat implements Friendly {\n    public void eat() {\n        System.out.println(\"Chomp, chomp, chomp\");\n    }\n\n    public void sayHello() {\n        System.out.println(\"Rub, rub, rub\");\n    }\n\n    public void sayGoodbye() {\n        System.out.println(\"Samper\");\n    }\n\n    protected void finalze() {\n        System.out.println(\"Meow\");\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
4. CockerSpaniel<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic class CockerSpaniel extends Dog implements Friendly {\n    private int woofCount = ((int) (Math.random() * 4.0)) + 1;\n\n    private int wimperCount = ((int) (Math.random() * 3.0)) + 1;\n\n    public void sayHello() {\n        super.sayHello();\n\n        System.out.println(\"Woof\");\n        for (int i = 0; i < woofCount; i++) {\n            System.out.println(\", woof\");\n        }\n    }\n\n    public void sayGoodbye() {\n        System.out.println(\"Wimper\");\n        for (int i = 0; i < wimperCount; i++) {\n            System.out.println(\", wimper\");\n        }\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u5bf9\u8c61\u6620\u50cf\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n
\"\"<\/p>\n
\u8bf4\u660e\uff1a\u5ffd\u7565\u4e86Object\u7684\u5b9e\u4f8b\u53d8\u91cf\u3002\u6765\u81ea\u8d85\u7c7b\u7684\u5b9e\u4f8b\u53d8\u91cf\u51fa\u73b0\u5728\u5b50\u7c7b\u5b9e\u4f8b\u53d8\u91cf\u4e4b\u524d\uff0c\u53ef\u4ee5\u770b\u5230\uff0cDog\u7684\u5b9e\u4f8b\u53d8\u91cfwagCount\u7684\u7d22\u5f15\u4e3a1\uff0c\u4e0eCockerSpaniel\u7684\u7d22\u5f15\u76f8\u540c\uff0c\u4e4b\u540e\u6309\u7167\u53d8\u91cf\u51fa\u73b0\u7684\u987a\u5e8f\u4f9d\u6b21\u5b58\u653e\u3002<\/p>\n
Dog\u865a\u65b9\u6cd5\u8868<\/p>\n
\"\"<\/p>\n
\u8bf4\u660e\uff1a\u5f3a\u8c03\uff0c\u975e\u865a\u65b9\u6cd5\u4e0d\u4f1a\u51fa\u73b0\u5728\u6b64\u8868\u4e2d\uff0c\u6ca1\u6709\u91cd\u5199\u7684Object\u7684\u65b9\u6cd5\u6307\u5411Object\u7c7b\u578b\u6570\u636e\u4e2d\u7684\u65b9\u6cd5\u7684\u5b9e\u9645\u5165\u53e3\u5730\u5740\u3002<\/p>\n
CockerSpaniel\u65b9\u6cd5\u8868\u3000\u3000\"\"\u3000\u3000\u8bf4\u660e\uff1a\u53ef\u4ee5\u770b\u5230\u88ab\u8986\u76d6\u7684sayHello\u65b9\u6cd5\u6307\u5411\u4e86CockerSpaniel\u7c7b\u578b\u6570\u636e\uff0csayHello\u65b9\u6cd5\u7684\u7d22\u5f15\u5728Dog\u4e0eCockerSpaniel\u4e2d\u662f\u76f8\u540c\u7684\u3002<\/p>\n
Cat\u65b9\u6cd5\u8868<\/p>\n
\"\"\u3000\u3000\u8bf4\u660e\uff1a\u7531CockerSpaniel\u548cCat\u7684\u65b9\u6cd5\u8868\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff0csayHello\u65b9\u6cd5\u4e0esayGoodbye\u65b9\u6cd5\u5728\u4e24\u8005\u7684\u65b9\u6cd5\u8868\u4e2d\u7684\u7d22\u5f15\u662f\u4e0d\u76f8\u540c\u7684\uff0cCockerSpaniel\u4e0eCat\u4e24\u4e2a\u7c7b\u4e4b\u95f4\u6ca1\u6709\u5173\u7cfb\uff0c\u6240\u4ee5\u63a5\u53e3\u7684\u65b9\u6cd5\u7684\u7d22\u5f15\u53ef\u4ee5\u4e0d\u76f8\u540c\u3002<\/p>\n
\u793a\u4f8b\uff1a<\/p>\n
\"\"<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
package com.leesf.chapter8;\n\npublic class Tester {\n    public static void main(String[] args) {\n        Dog dog = new CockerSpaniel();\n        dog.sayHello();\n        Friendly fr = (Friendly) dog;\n        fr.sayGoodbye();\n        fr = new Cat();\n        fr.sayGoodbye();\n    }\n}<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n<\/div>\n
\u8bf4\u660e\uff1afr\u9996\u5148\u6307\u5411CockerDaniel\uff0c\u7136\u540e\u8c03\u7528\u4e86\u65b9\u6cd5sayGoodbye\uff0c\u65b9\u6cd5\u7684\u7d22\u5f15\u4e3a11\u3002\u7136\u540efr\u53c8\u6307\u5411\u4e86Cat\uff0c\u8c03\u7528\u4e86\u65b9\u6cd5sayGoodbye\uff0c\u65b9\u6cd5\u7d22\u5f15\u4e3a12\uff0c\u7d22\u5f15\u503c\u4e0d\u540c\uff0c\u4e0d\u80fd\u4ec5\u4ec5\u5207\u6362\u65b9\u6cd5\u8868\uff0c\u8fd8\u8981\u91cd\u65b0\u641c\u7d22\uff08Cat\u7684\uff09\u65b9\u6cd5\u8868\u3002\u865a\u62df\u673a\u4ece\u63a5\u53e3\u5f15\u7528\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u5b83\u5fc5\u987b\u641c\u7d22\u7c7b\u7684\u65b9\u6cd5\u8868\u6765\u627e\u5230\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u5e76\u4e0d\u80fd\u50cf\u4e4b\u524d\u90a3\u6837\u6839\u636e\u7236\u7c7b\u65b9\u6cd5\u7684\u7d22\u5f15\u76f4\u63a5\u53ef\u4ee5\u786e\u5b9a\u5b50\u7c7b\u65b9\u6cd5\u7684\u7d22\u5f15\uff08\u56e0\u4e3a\u7236\u7c7b\u7684\u65b9\u6cd5\u4e0e\u5b50\u7c7b\u7684\u65b9\u6cd5\u7684\u7d22\u5f15\u76f8\u540c\uff09\uff0c\u800c\u662f\u9700\u8981\u626b\u63cf\u6574\u4e2a\u65b9\u6cd5\u8868\u624d\u80fd\u786e\u5b9a\u3002\u8fd9\u79cd\u8c03\u7528\u63a5\u53e3\u5f15\u7528\u7684\u5b9e\u4f8b\u65b9\u6cd5\u6bd4\u7c7b\u5f15\u7528\u8c03\u7528\u5b9e\u4f8b\u65b9\u6cd5\u6162\u5f97\u591a\u3002<\/p>\n
\u56db\u3001\u603b\u7ed3<\/strong><\/p>\n
\u901a\u8fc7\u6267\u884c\u5f15\u64ce\u7684\u5b66\u4e60\uff0c\u660e\u767d\u4e86\u65b9\u6cd5\u5728\u865a\u62df\u673a\u5185\u90e8\u5982\u4f55\u88ab\u6267\u884c\u7684\u3002\u53ea\u6709\u5199\u4e0b\u6765\u7684\u77e5\u8bc6\u7406\u89e3\u624d\u4f1a\u66f4\u6df1\u523b\uff0c\u8c22\u8c22\u5404\u4f4d\u56ed\u53cb\u7684\u89c2\u770b~<\/p>\n","protected":false},"excerpt":{"rendered":"
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